I tend to order from highspots since I usually buy PWG in no particular order (just whatever sounds good at the time) and they usually have somekind of deal going, making it even more tempting to spend some dosh on PWG... (plus the currency rates right now between the pound and dollar = )

I honestly haven't ordered though the PWG site before so I can't really give any reviews of their service. Although, I've been meaning to buy those Super. D DVDs for a while now